Transactions of Nanjing University of Aeronautics & Astronautics
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A method of resolution increase and noise removal in using shifrin-transform to measure particle size distribution
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Abstract:
Based on laser diffraction and Shifrin-transform, the measurement method of particle size distribution has been improved extensively. While, in real measurements, some noise peaks exist in the data of inversion and are misread as particle distribution peaks. On the other hand, the improved method used a truncation function as a filter is hard to distinguish adjacent peaks. In this paper, by introducing bimodal resolution criterion, the filter function is optimized. And a quasi truncation function with the optimized filter function is studied to achieve optimal bimodal resolution and remove noise peaks. This new quasi truncation function fits multimode distribution very well. By combining the quasi truncation function with Shifrin-transform, noise peaks are removed well and the adjacent peaks are distinguished clearly. Finally, laser diffraction experiments are applied and the particle size distribution is analyzed by applying this method. The results show that the quasi truncation function has better bimodal resolution than the truncation function. Generally, by combining the quasi truncation function with Shifrin-transform, in particle size distribution measurements with laser diffraction, the bimodal resolution is greatly increased and the noise is removed well. And our results can restore perfectly the original distribution. Therefore, the new method by combining the quasi truncation function with Shifrin-transform provides a feasible and effective way to measure the multimode particle size distribution by laser diffraction.
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